US5222907A - Multiple-pin connector - Google Patents

Abstract

A plug-in multiple-pin connector has a plug mounted on the backboard of a bookshelf-type unit and a socket mounted on the rear end of a package insertable into the bookshelf-type unit. The plug includes arrays of pins fixed to the bottom of a box-shaped insulative casing and an aligning plate having through holes through which the pins extend. The aligning plate is held in sliding contact with the inner wall surfaces of the plug. The socket has arrays of contact insertion holes defined therein and arrays of socket elements having ends each disposed in the contact insertion holes. When the socket is inserted into the plug, the socket pushes the aligning plate over the pins toward the casing bottom until the aligning plate is held against the casing bottom whereupon engaging prongs on the aligning plate are each forcibly fitted in engaging prongs in the aligning plate. When the socket is pulled out of the plug, the aligning plate is stopped against dislodgement by stoppers of the casing. The pins which are slender and close-spaced are protected against buckling and bending by the aligning plate.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a connector for use with communications devices, and more particularly to a plug-in multiple-pin connector for use on the rear end of a package to be inserted into a bookshelf-type unit.

2. Description of the Related Art

Bookshelf-type units have a pair of upper and lower panels with a plurality of upper and lower guide rails mounted on the inner surfaces thereof and a backboard extending between the upper and lower panels. A plug-in multiple-pin connector for use with such a bookshelf-type unit comprises a plug mounted on the backboard and a socket mounted on the rear end of a package supporting an electronic circuit. The package is inserted into the book-shelf-type unit with the upper and lower edges of the package being guided along upper and lower guide rails until the socket is electrically connected to the plug. When a plurality of packages are inserted into the bookshelf-type unit, the packages jointly make up a communications device.

FIGS. 1 and 2 of the accompanying drawings shows one such conventional plug-in multiple-pin connector for use with a bookshelf-type unit.

As shown in FIG. 1, bookshelf-type unit 51 hasbackboard 52 positioned on the back of the unit and supporting a plurality ofplugs 56.Package 53 with an electronic circuit thereon hassocket 54 on its rear end.Package 53 is inserted into bookshelf-type unit 51 along selected upper andlower guide rails 55 on upper and lower panels of bookshelf-type unit 51. The distance between the bottoms of the guide grooves in upper andlower guide rails 55 is slightly larger than the vertical dimension ofpackage 53, so thatpackage 53 is slightly loose vertically inguide rails 55 whensocket 54 is inserted intoplug 56.

As shown in FIG. 2, whensocket 54 is fitted intoplug 56,socket 54 is guided bybeveled edges 56b on the open end of box-shapedinsulative casing 56a ofplug 56.Socket 54 has a plurality ofcontact insertion holes 54a each withbeveled surfaces 54b at their open ends. Assocket 54 is inserted intoplug 56,pins 56c ofplug 56 are each guided bybeveled surfaces 54b and inserted intocontact insertion holes 54a untilpins 56c are each electrically connected tosocket elements 54c.

The conventional plug-in multiple-pin connector suffers from the following two drawbacks:

Recently, there is a demand for more pins per connector and smaller connector sizes to achieve higher packaging density. It is therefore necessary to reduce pin-to-pin spacing and pin diameter. If a package with a plug-in multiple-pin connector designed to meet those requirements is inserted quickly into a bookshelf-type unit, then when the pins strike the beveled surfaces of the contact insertion holes, the pins tend to buckle due to their low mechanical strength, and fail to fit well into the contact insertion holes.

Inasmuch as the pins are slender, they are highly likely to bend under external force, particularly when they are improperly handled while multiple-pin connectors are being fabricated. The small pin-to-pin spacing requires contact insertion holes to have smaller beveled surfaces, making it necessary for the pins to have a minimum degree of bending tolerance. The strict pin tolerance greatly affects both the yield of multiple-pin connectors and the electric connection reliability of the connectors.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a multiple-pin connector which has pins resistant to buckling or bending.

According to the present invention, there is provided a multiple-pin connector comprising a plug comprising a box-shaped insulative casing having an open side, a bottom surface opposite to the open side, and surrounding walls surrounding the bottom surface, and an array of pins fixedly mounted on the bottom surface of the casing, a socket comprising an insulative housing insertable into the casing through the open side, and an aligning plate movably disposed in the casing and held in sliding contact with the surrounding walls of the casing, the aligning plate having an array of through holes, the pins extending through each of the through holes, the insulative housing and the aligning plate having engaging means for engaging the insulative housing and the aligning plate with each other when the socket is inserted into the plug, the surrounding walls being higher than the pins and having stopper projecting inwardly from distal ends of the surrounding walls at the open side, for preventing the aligning plate from being dislodged from the plug.

The stoppers are disposed in a position in which the pins have tip ends projecting from the aligning plate which is engaged by the stoppers when the socket is removed from the plug.

The distal ends of the surrounding walls have beveled surfaces for guiding the socket when the socket is inserted into the plug.

The multiple-pin connector according to the present invention is designed to reinforce the pins, which are slender, for greater mechanical strength against buckling or bending when they are handled, and also for meeting the requirement for a lower degree of bending tolerance. The aligning plate, which is movably disposed in the casing and held in sliding contact with the surrounding walls of the casing, is positioned in the upper limit position remote from the bottom surface of the casing when the socket is not fitted in the plug. In the upper limit position, the tip ends of the pins slightly project from the aligning plate, and hence the pins are prevented from bending, and also from buckling when they are hit by the socket.

When the socket is inserted into the plug, the aligning plate is pushed by the socket. Continued insertion of the socket into the plug pushes the aligning plate into the plug until the aligning plate reaches the lower limit position against the bottom surface of the casing, whereupon the socket is fully fitted in the plug. To remove the socket from the plug, the socket is pulled out of the plug, and the aligning plate moves with the socket to the upper limit position. When the aligning plate reaches the upper limit position, it abuts the stoppers of the surrounding walls of the casing, and is prevented from being dislodged from the casing. The socket is further pulled out of the plug, disengaging from the aligning plate.

The above and other objects, features and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate a preferred embodiment of the present invention by way of example.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a fragmentary perspective view of a bookshelf-type unit and a package with a conventional plug-in multiple-pin connector;

FIG. 2 is an enlarged side elevational view, partly in cross section, of the conventional plug-in multiple-pin connector;

FIGS. 3a through 3c are enlarged side elevational views, partly in cross section, of a plug-in multiple-pin connector according to the present invention; and

FIG. 4 is an enlarged perspective view of the plug-pin-multiple pin connector according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIGS. 3a through 3c and 4 show a plug-in multiple-pin connector according to the present invention.

The plug-in multiple-pin connector according to the present invention is useful when employed on the backboard of a bookshelf-type unit and in a package insertable into the bookshelf-type unit, as is the case with the conventional arrangement shown in FIG. 1.

As shown in FIGS. 3a through 3c, the plug-in multiple-pin connector according to the present invention comprisesplug 1 mounted onbackboard 2 on the back of a bookshelf-type unit (not shown), andsocket 4 on the rear end ofpackage 3.Package 3 can be inserted into the bookshelf-type unit while being guided along guide rails (not shown) on the upper and lower panels of the bookshelf-type unit.

Plug 1 comprises box-shapedinsulative casing 5 with one side open opposite to its bottom, a plurality of arrays of pins 6 fixed to the bottom ofcasing 5, and aligningplate 7 movably disposed incasing 5 and having outer circumferential edges held in sliding contact withinner wall surfaces 5a ofcasing 5.

Casing 5 has surrounding walls higher than pins 6 and havingstoppers 5b projecting inwardly from the distal ends thereof at the open side ofcasing 5. Stoppers 5b define the upper limit position remote from the bottom surface ofcasing 5, for limiting sliding movement of aligningplate 7 incasing 5, and serve to prevent aligningplate 7 from being dislodged fromcasing 5. The distal ends of the surrounding walls ofcasing 5 have beveledsurfaces 5c on the inner edges thereof, which serve as guide surfaces for guidingsocket 4 whensocket 4 is fitted intocasing 5.

Aligning plate 7 is of a rectangular shape identical to the bottom surface ofcasing 5 which is surrounded by the surrounding walls thereof. When aligningplate 7 is placed incasing 5, it is movable in sliding contact withinner wall surfaces 5a ofcasing 5 as described above.Aligning plate 7 has a plurality of arrays of as many throughholes 7a defined therein as the number of pins 6, throughholes 7a having cross-sectional dimensions slightly greater than those of pins 6.

As shown in FIG. 4, aligningplate 7 has a pair ofengaging holes 7b defined in each upper and lower end thereof for receivingengaging prongs 4d disposed on each upper and lower end ofsocket 4. Engagingholes 7b andengaging prongs 4d jointly serve as engaging means.Aligning plate 7 also has a pair ofslots 7c defined in each end thereof and connected to eachengaging holes 7b,slots 7c being open at the upper and lower end surfaces of aligningplate 7.Engaging holes 7b have a diameter substantially equal to or slightly smaller than the diameter ofengaging prongs 4d. The upper and lower ends of aligningplate 7 whereengaging holes 7b andslits 7c are defined are rendered springy or resilient whenslits 7c are spread by engagingprongs 4d forcibly inserted into eachengaging hole 7b. Whenengaging prongs 4d are forcibly inserted into respectiveengaging holes 7b, aligningplate 7 andsocket 4 are held in interfitting engagement with each other.

As shown in FIGS. 3a through 3c,socket 4 is in the form of an insulative housing and has a plurality of arrays ofsocket elements 4c having inner ends each disposed incontact insertion holes 4a defined insocket 4. Whensocket 4 is fitted incasing 5, pins 6 are inserted throughcontact insertion holes 4a into eachsocket element 4c, thus achieving electric connection between pins 6 andsocket elements 4c. As shown in FIG. 3b,contact insertion holes 4a each have beveledsurfaces 4b at the outer ends thereof.

Socket 4 is fitted intoplug 5 as follows:

Whenpackage 3 is inserted into the book-shelf-type unit and beforesocket 4 reaches plug 5, aligningplate 7 is positioned in the upper limit position in which it is held againststoppers 5b, as shown in FIG. 3a. At this time, pins 6 have their tip ends projecting slightly from aligningplate 7.

Whensocket 4 begins to be inserted intoplug 1 as shown in FIG. 3b,socket 4 is guided bybeveled surfaces 5c. Therefore,socket 4 can easily be inserted into the open end ofcasing 5. At this time, aligningplate 7 is pushed by lockingprongs 4d ofsocket 4, and pins 6 are guided bybeveled surfaces 4b and then start fitting into eachcontact insertion hole 4a.

Whensocket 4 is further inserted intoplug 1, as shown in FIG. 3c, aligningplate 7 is pushed to the lower limit position against the bottom surface ofcasing 5, and engagingprongs 4d are each forced into engagingholes 7b in aligningplate 7. At this time, pins 6 are are each electrically connectd tosocket elements 4c.

Socket 4 is removed fromplug 1 as follows:

Whensocket 4 is pulled in the direction out ofcasing 5, aligningplate 7 that is engaged by engagingprongs 4d ofsocket 4 is carried incasing 5 to the upper limit position bysocket 4. Upon abutting engagement of aligningplate 7 withstoppers 5b ofcasing 5, aligningplate 7 is stopped against further movement. Continued pulling ofsocket 4 displaces engagingprongs 4d out of engagingholes 7b, andsocket 4 disengages from aligningplate 7 and returns to the position shown in FIG. 3a.

Aligningplate 7 movably disposed incasing 5 is effective to reinforce the mechanical strength of pins 6 which are relatively slender. Therefore,socket 4 can reliably and smoothly be fitted intoplug 1 without fail.

Pins 6 are thin and closely spaced because of recent trends toward a large number of pins per connector and high packing density. Nevertheless, the mechanical strength of pins 6 against buckling and bending which would otherwise occur when hit bysocket 4 is increased by aligningplate 7 which is held in sliding contact with the inner wall surfaces 5a ofcasing 5. In addition, pins 6 are also protected against bending by aligningplate 7 while the plug-in multiple-pin connector is being manufactured. The degree of bending tolerance for pin 6 may be increased even through the pin-to-pin spacing is small. The plug-in multiple-pin connector can thus be manufactured highly reliably at a high production ratio.

Although a certain preferred embodiment of the present invention has been shown and described in detail, it should be understood that various changes and modifications may be made therein without departing from the scope of the appended claims.

Claims (4)

What is claimed is:

1. A multiple-pin connector comprising:

a plug comprising a box-shaped insulative casing having an open side, a bottom opposite to said open side, and surrounding walls surrounding said bottom, and an array of pins fixedly mounted on said bottom of said casing;

a socket comprising an insulative housing insertable into said casing through said open side; and

an aligning plate movably disposed in said casing and held in sliding contact with surrounding walls of said casing, said aligning plate having an array of through holes, said pins each extending through said through holes;

said insulative housing and said aligning plate having engaging means for engaging said insulative housing and said aligning plate with each other when said socket is inserted into said plug;

said surrounding walls being higher than said pins and having stoppers projecting inwardly from distal ends of said surrounding walls at said open side, for preventing said aligning plate from being dislodged from said plug.

2. A multiple-pin connector according to claim 1, wherein said stoppers are disposed in a position in which said pins have tip ends projecting from said aligning plate which is engaged by said stoppers when said socket is removed from said plug.

3. A multiple-pin connector according to claim 1, wherein said distal ends of said surrounding walls have beveled surface for guiding said socket when the socket is inserted into said plug.

4. A multiple-pin connector according to claim 2, wherein said distal ends of said surrounding walls have beveled surfaces for guiding said socket when the socket is inserted into said plug.

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